20111120202111 has 16 divisors (see below), whose sum is σ = 27387907315200. Its totient is φ = 13120926448448.

The previous prime is 20111120202091. The next prime is 20111120202221. The reversal of 20111120202111 is 11120202111102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20111120202111 - 2¹³ = 20111120193919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111120204111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5126646 + ... + 8155043.

It is an arithmetic number, because the mean of its divisors is an integer number (1711744207200).

Almost surely, 2^{20111120202111} is an apocalyptic number.

20111120202111 is a deficient number, since it is larger than the sum of its proper divisors (7276787113089).

20111120202111 is a wasteful number, since it uses less digits than its factorization.

20111120202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13292478.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111120202111 its reverse (11120202111102), we get a palindrome (31231322313213).

The spelling of 20111120202111 in words is "twenty trillion, one hundred eleven billion, one hundred twenty million, two hundred two thousand, one hundred eleven".